WO2000018528A1 - Method and device for connecting overlapping flat parts - Google Patents

Method and device for connecting overlapping flat parts Download PDF

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Publication number
WO2000018528A1
WO2000018528A1 PCT/DE1999/003064 DE9903064W WO0018528A1 WO 2000018528 A1 WO2000018528 A1 WO 2000018528A1 DE 9903064 W DE9903064 W DE 9903064W WO 0018528 A1 WO0018528 A1 WO 0018528A1
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WO
WIPO (PCT)
Prior art keywords
die
punch
stamp
undercut
joining process
Prior art date
Application number
PCT/DE1999/003064
Other languages
German (de)
French (fr)
Inventor
Wolfgang Voelkner
Gerald Effenberg
Reinhard Mauermann
Original Assignee
Technische Universität Dresden
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Technische Universität Dresden filed Critical Technische Universität Dresden
Priority to JP2000572038A priority Critical patent/JP2002525208A/en
Priority to US09/787,751 priority patent/US6473957B1/en
Priority to DE59904661T priority patent/DE59904661D1/en
Priority to EP99955786A priority patent/EP1115518B1/en
Priority to AT99955786T priority patent/ATE234696T1/en
Priority claimed from DE19945743A external-priority patent/DE19945743A1/en
Publication of WO2000018528A1 publication Critical patent/WO2000018528A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/02—Riveting procedures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/03—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal otherwise than by folding
    • B21D39/031—Joining superposed plates by locally deforming without slitting or piercing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/10—Riveting machines
    • B21J15/12—Riveting machines with tools or tool parts having a movement additional to the feed movement, e.g. spin
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
    • F16B5/04—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of riveting
    • F16B5/045—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of riveting without the use of separate rivets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49924—Joining by deforming of parallel side-by-side elongated members
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49938—Radially expanding part in cavity, aperture, or hollow body
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53039—Means to assemble or disassemble with control means energized in response to activator stimulated by condition sensor
    • Y10T29/53061—Responsive to work or work-related machine element
    • Y10T29/53065—Responsive to work or work-related machine element with means to fasten by deformation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53996—Means to assemble or disassemble by deforming

Definitions

  • the invention relates to a method for connecting overlapping plate-shaped components according to the preamble of claim 1.
  • the invention also relates to a device for connecting overlapping plate-shaped components according to the preamble of claim 4.
  • DE 39 23 182 C2 discloses a device for connecting plate-shaped components arranged one above the other with a stamp, in which a split die is used.
  • a base body with complementary conical surfaces is provided for mounting the die parts, as well as a return spring for prestressing the base body in the direction of movement of the punch.
  • a punch penetrates into the sheets to be connected in a straight movement during the working stroke, with a fixed or divided die on the opposite side having the shape of the so-called die side of the clinching point.
  • a counter punch is positioned in the divided die.
  • the disadvantage is that high forces are required in the known clinching. Therefore, the tool and tool rack loads are high and limit the application for high-strength sheet metal.
  • the high joining forces make great demands on the guidance of the tools when precise coaxial alignment is required between the punch and the die.
  • the throat and thus the applicability of the process are limited with high forces.
  • the thickness of the stamp-side sheet in the so-called neck area is greatly tapered and the undercut is made only slightly, which limits the connection strength.
  • the superimposition of a wobble movement on a joining feed movement is known from wobble riveting.
  • the wobble riveting is used to by partial upsetting and embossing operations, e.g. on an auxiliary joining part to achieve a positive connection.
  • the object of the invention is to reduce the forces to be applied during clinching. This is intended to significantly expand the areas of application with regard to high-strength materials and the accessibility of large components with C-frames.
  • the task also consists in eliminating the weak points of low neck thickness and small undercut and thus achieving a higher connection strength for the same joining task. Furthermore, complicated dies and the effort required for coaxial positioning of the punch and die should be avoided as far as possible.
  • the object is achieved by a method with the features mentioned in claim 1.
  • Advantageous variants of the method result from the dependent subclaims.
  • the object is further achieved by a device with the features mentioned in claim 4.
  • Advantageous embodiments result from the features mentioned in claims 5 to 9.
  • a wobbling movement of the forming die and a variable punch force are superimposed on the axial feed movement, the wobbling movement and the variable punch force being controlled in a coordinated manner.
  • the stamping force is controlled so that the stamping force increases from the center of the clinching point to the outside during the migration of the contact surface formed between the stamping face and the workpiece, and the stamping force is reduced from outside to inside during the migration of this surface.
  • the material is partially reshaped by the wobble movement, so that the process forces decrease significantly.
  • the desired material flow radially from the inside to the outside is achieved by the variable stamping force
  • the wobble movement itself can be superimposed on the axial feed movement during the entire joining process or during part of the joining process
  • a mechanically driven mechanism is provided on the forming die, which sets the latter in a wobbling motion. Furthermore, a mechanically, servohydraulically, piezzoelectric or the like driven mechanism is provided, which advances the forming die against the recess of the die with a variable stamping force Applying and controlling the variable stamp force to the form stamp
  • the sheets rest on a fixed or movable die with or without a counter punch or only on a smooth anvil
  • a special geometry of the die in connection with the wobble movement at the beginning of the joining process allows more material to be drawn into the forming zone.
  • material is printed radially from the bottom area to the neck area and thus from an area in where accumulation is not necessary, is shifted to the neck area, which is crucial for the strength of the connection
  • the shaped punch has an end shape as radii R1 / R2 and / or as a cone and / or as a trailing curve, the radius Rl being larger than the maximum punch diameter and R2 being smaller than the maximum punch diameter in the case of training with pure radii
  • the counter-punch has an end shape, either with a radius R3 and / or a cone and / or a drag curve, the radius R3 being larger than the maximum punch diameter in the case of a design with a pure radius
  • the form stamp has an undercut on the stamp, at which the maximum stamp diameter experiences such a taper that a collision between the shaft of the form stamp and the cylindrical part of the stamp-side sheet is prevented
  • a fixed die can also be used. This should then have a shaping slope with an angle and / or transition curves between the die face and bottom
  • Fig. 1 the well-known clinching with divided die and counter-punch
  • Fig. 2 is a die in a deflected position at the end of the forming process
  • FIG. 4 shows a device with a fixed die and a flat anvil
  • Fig. 1 the well-known clinching with divided die 4 and counter-punch 5 is shown.
  • the punch 1 penetrates into the plates 2 and 3 to be connected in an axial movement.
  • the known positive-locking effect the so-called positive-locking effect
  • Undercut 6 achieved between the joint partners, the process being carried out up to a predetermined residual floor thickness 7 and a neck region 8 being formed as a decisive criterion for the connection strength
  • the center point of the clinching point 13 is passed through several times.
  • the stamping force is reduced during the inward movement 14 in the direction of the center of the point, in extreme cases to zero, and a high stamping force F is realized with the outward movement 15
  • the punch force F has a larger value with increasing value ⁇ and thus presses the
  • the die undercut 9 of the die la is a prerequisite for a horizontally displacement-free process and enables a cylindrical inner contour of the joint point
  • FIG. 4 shows the device with a fixed die 10 on the right side of the center line and in the bottom dead center on the left side with a flat anvil 11. Again, the material flow achieves a well-developed neck area 8 and an undercut 6 with a small base thickness 7. the undercut 6a is smaller in the case of a flat anvil 11 but is sufficient for many applications

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Control Of Presses (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

The invention relates to a method for connecting overlapping flat parts in a mechanical joining process, for example for connecting panels, using a mould stamp (1a) and a matrix which is provided with a recess, the parts to be connected being placed between the mould stamp and the matrix. The invention is characterised in that the active axial advancing movement of the mould stamp (1a) is impressed with a tumbling motion throughout the entire joining process or during a part of the joining process and with a variable stamping force (F) which is dependent on said tumbling motion, in order to produce a flow of material that is oriented towards the undercut (6). The invention also relates to a device for carrying out the inventive method.

Description

Verfahren und Vorrichtung zum Verbinden von sich überlappenden plattenförmigen BauteilenMethod and device for connecting overlapping plate-shaped components
Die Erfindung betrifft ein Verfahren zum Verbinden von sich überlappenden plattenförmigen Bauteilen nach dem Oberbegriff des Anspruchs 1. Die Erfindung betrifft außerdem eine Vorrichtung zum Verbinden von sich überlappenden plattenförmigen Bauteilen nach dem Oberbegriff des Anspruchs 4.The invention relates to a method for connecting overlapping plate-shaped components according to the preamble of claim 1. The invention also relates to a device for connecting overlapping plate-shaped components according to the preamble of claim 4.
Aus der DE 40 09 813 Cl ist eine Vorrichtung zum Verbinden von sich überlappenden plattenförmigen Bauteilen bekannt. Mit einer derartigen Vorrichtung lassen sich Blechen durch das sogenannte Clinchen verbinden. Die Besonderheit bei dieser Vorrichtung besteht darin, daß im Bereich des Umfangrandes der Ausnehmung der Matrize ein verformbares Material vorgesehen ist, das weicher als das der zu verbindenden Bleche ist. Damit soll auf eine übliche Teilung der Matrize verzichtet werden.From DE 40 09 813 Cl a device for connecting overlapping plate-shaped components is known. With such a device, sheets can be connected by so-called clinching. The special feature of this device is that a deformable material is provided in the region of the peripheral edge of the recess of the die, which is softer than that of the sheets to be connected. This is intended to dispense with the usual division of the die.
Aus der DE 39 23 182 C2 ist eine Vorrichtung zum Verbinden von übereinander angeordneten plattenförmigen Bauteilen mit einem Stempel bekannt, bei der eine geteilte Matrize verwendet wird. Zur Lagerung der Matrizenteile ist ein Grundkörper mit komplementären Kegelflächen vorgesehen, sowie eine Rückholfeder zur Vorspannung auf dem Grundkörper in Bewegungsrichtung des Stempels.DE 39 23 182 C2 discloses a device for connecting plate-shaped components arranged one above the other with a stamp, in which a split die is used. A base body with complementary conical surfaces is provided for mounting the die parts, as well as a return spring for prestressing the base body in the direction of movement of the punch.
Beim Clinchen, unter Verwendung von Vorrichtungen nach DE 40 09 813 Cl oder DE 39 23 182 C2, dringt ein Stempel beim Arbeitshub in einer geradlinigen Bewegung in die zu verbindenden Bleche ein, wobei auf der Gegenseite eine feste oder geteilte Matrize die Form der sogenannten Matrizenseite des Clinchpunktes mit ausbildet. In der geteilten Matrize wird ein Gegenstempel positioniert.When clinching, using devices according to DE 40 09 813 Cl or DE 39 23 182 C2, a punch penetrates into the sheets to be connected in a straight movement during the working stroke, with a fixed or divided die on the opposite side having the shape of the so-called die side of the clinching point. A counter punch is positioned in the divided die.
Mit dem Einbringen der Vertiefung durch die Werkzeuge wird neben dem Kraftschluß der bekannte Formschlußeffekt, die sogenannte Hinterschneidung, zwischen den Fügepartnern erzielt, wobei der Vorgang bis zu einer vorgegebenen Bodendicke durchgeführt wird.With the introduction of the recess through the tools, in addition to the frictional connection, the known positive locking effect, the so-called undercut, is achieved between the joining partners, the process being carried out up to a predetermined base thickness.
Nachteilig ist, daß beim bekannten Clinchen hohe Kräfte benötigt werden. Deshalb sind die Werkzeug- und Werkzeuggestellbelastungen hoch und schränken die Anwendung bei hochfesten Blechen ein. Durch die hohen Fügekräfte werden bei der Notwendigkeit genauer koaxialer Ausrichtung zwischen Stempel und Matrize große Anforderungen an die Führung der Werkzeuge gestellt. Für die überwiegend als Werkzeuggestell eingesetzten C-Bügel wird mit hohen Kräften die Ausladung und damit die Anwendbarkeit des Verfahrens eingegrenzt.The disadvantage is that high forces are required in the known clinching. Therefore, the tool and tool rack loads are high and limit the application for high-strength sheet metal. The high joining forces make great demands on the guidance of the tools when precise coaxial alignment is required between the punch and the die. For the C-frame, which is mainly used as a tool frame, the throat and thus the applicability of the process are limited with high forces.
Durch die geradlinige Stempelbewegung wird die Dicke des Stempel seitigen Bleches im sogenannten Halsbereich stark verjüngt und der Hinterschnitt nur gering ausgebildet, wodurch die Verbindungsfestigkeit begrenzt wird.Due to the straight stamp movement, the thickness of the stamp-side sheet in the so-called neck area is greatly tapered and the undercut is made only slightly, which limits the connection strength.
Die Überlagerung einer Taumelbewegung zu einer Fügevorschubbewegung ist vom Taumelnieten her bekannt. Das Taumelnieten wird angewandt, um durch partielle Stauch- und Prägeoperationen, z.B. an einem Hilfsfügeteil, eine formschlüssige Verbindung zu erzielen.The superimposition of a wobble movement on a joining feed movement is known from wobble riveting. The wobble riveting is used to by partial upsetting and embossing operations, e.g. on an auxiliary joining part to achieve a positive connection.
Aufgabe der Erfindung ist es, die beim Clinchen aufzubringenden Kräfte zu senken. Damit sollen die Anwendungsgebiete bezüglich hochfester Werkstoffe und die Zugänglichkeit bei großen Bauteilen mit C-Bügeln wesentlich erweitert werden. Die Aufgabe besteht weiterhin darin, die Schwachstellen geringe Halsdicke und geringer Hinterschnitt zu beseitigen und damit bei der gleichen Fügeaufgabe eine höhere Verbindungsfestigkeit zu erreichen. Ferner sollen komplizierte Matrizen und der notwendige Aufwand zum koaxialen Positionieren von Stempel und Matrize nach Möglichkeit entfallen.The object of the invention is to reduce the forces to be applied during clinching. This is intended to significantly expand the areas of application with regard to high-strength materials and the accessibility of large components with C-frames. The task also consists in eliminating the weak points of low neck thickness and small undercut and thus achieving a higher connection strength for the same joining task. Furthermore, complicated dies and the effort required for coaxial positioning of the punch and die should be avoided as far as possible.
Erfindungsgemäß wird die Aufgabe durch ein Verfahren mit den im Anspruch 1 genannten Merkmalen gelöst. Vorteilhafte Varianten des Verfahrens ergeben sich aus den abhängigen Unteransprüchen. Die Aufgabe wird weiterhin durch eine Vorrichtungen mit den im Anspruch 4 genannten Merkmalen gelöst. Vorteilhafte Ausgestaltungen ergeben sich aus den in den Ansprüchen 5 bis 9 genannten Merkmalen.According to the invention the object is achieved by a method with the features mentioned in claim 1. Advantageous variants of the method result from the dependent subclaims. The object is further achieved by a device with the features mentioned in claim 4. Advantageous embodiments result from the features mentioned in claims 5 to 9.
Bei dem Verfahren wird der axialen Vorschubbewegung eine taumelnde Bewegung des Formstempels und eine variable Stempelkraft überlagert, wobei die taumelnde Bewegung und die variable Stempelkraft aufeinander abgestimmt gesteuert werden.In the method, a wobbling movement of the forming die and a variable punch force are superimposed on the axial feed movement, the wobbling movement and the variable punch force being controlled in a coordinated manner.
Während der Stempel eine Taumelbewegung ausfuhrt wird die Stempelkraft so gesteuert, daß während der Wanderung der zwischen Stempelstirn und Werkstück gebildeten Kontaktfläche vom Mittelpunkt des Clinchpunktes nach außen die Stempelkraft erhöht und während der Wanderung dieser Fläche von außen nach innen die Stempelkraft verringert wird. Durch die Taumelbewegung wird der Werkstoff partiell umgeformt, so daß die Prozeßkrafte deutlich sinken Durch die variable Stempelkraft wird der gewünschte WerkstofFfluß radial von innen nach außen realisiertWhile the stamp performs a wobbling movement, the stamping force is controlled so that the stamping force increases from the center of the clinching point to the outside during the migration of the contact surface formed between the stamping face and the workpiece, and the stamping force is reduced from outside to inside during the migration of this surface. The material is partially reshaped by the wobble movement, so that the process forces decrease significantly. The desired material flow radially from the inside to the outside is achieved by the variable stamping force
Die Taumelbewegung selbst kann wahrend des ganzen Fugeprozesses oder wahrend eines Teiles des Fugeprozesses der axialen Vorschubbewegung überlagert seinThe wobble movement itself can be superimposed on the axial feed movement during the entire joining process or during part of the joining process
Vorrichtungsgemaß ist am Formstempel ein mechanisch angetriebener Mechanismus vorgesehen, der diesen in eine Taumelbewegung versetzt Weiterhin ist ein mechanisch, servohydraulisch, piezzoelektrisch o dgl angetriebener Mechanismus vorgesehen, der den Formstempel mit einer variablen Stempelkraft gegen die Ausnehmung der Matrize vorschiebt In Abhängigkeit von der Taumellage wird die Beaufschlagung des Formstempels mit der variablen Stempelkraft ermittelt und gesteuertAccording to the device, a mechanically driven mechanism is provided on the forming die, which sets the latter in a wobbling motion. Furthermore, a mechanically, servohydraulically, piezzoelectric or the like driven mechanism is provided, which advances the forming die against the recess of the die with a variable stamping force Applying and controlling the variable stamp force to the form stamp
Auf der Gegenseite liegen die Bleche auf einer festen oder beweglichen Matrize mit oder ohne Gegenstempel oder aber nur auf einem glatten Amboß aufOn the opposite side, the sheets rest on a fixed or movable die with or without a counter punch or only on a smooth anvil
Eine spezielle Geometrie des Formstempels realisiert im Zusammenhang mit der Taumelbewegung am Beginn des Fugeprozesses den Einzug von mehr Material in die Umformzone Wahrend der Umformung und vor allem am Ende des Vorganges wird Material radial aus dem Bodenbereich in den Halsbereich gedruckt und damit aus einem Gebiet, in dem eine Anhäufung nicht notwendig ist, in den Halsbereich verlagert, der für die Festigkeit der Verbindung ausschlaggebend istA special geometry of the die in connection with the wobble movement at the beginning of the joining process allows more material to be drawn into the forming zone. During the forming process and especially at the end of the process, material is printed radially from the bottom area to the neck area and thus from an area in where accumulation is not necessary, is shifted to the neck area, which is crucial for the strength of the connection
Dazu besitzt der Formstempel eine Stirnform als Radien R1/R2 und/oder als Kegel und/oder als Schleppkurve, wobei bei einer Ausbildung mit reinen Radien der Radius Rl großer ist, als der maximale Stempeldurchmesser und R2 kleiner ist, als der maximale StempeldurchmesserFor this purpose, the shaped punch has an end shape as radii R1 / R2 and / or as a cone and / or as a trailing curve, the radius Rl being larger than the maximum punch diameter and R2 being smaller than the maximum punch diameter in the case of training with pure radii
Der Gegenstempels weist eine Stirnform aus, entweder mit einem Radien R3 und/oder einem Kegel und/oder einer Schleppkurve, wobei bei einer Ausbildung mit reinem Radius der Radius R3 großer ist, als der maximale Stempeldurchmesser Vorteilhaft besitzt der Formstempel eine Stempelhinterschneidung, an welcher der maximale Stempeldurchmesser eine solche Verjüngung erfahrt, daß eine Kollision zwischen dem Schaft des Formstempels und dem zylinderformigen Teil des stempelseitigen Bleches verhindert wirdThe counter-punch has an end shape, either with a radius R3 and / or a cone and / or a drag curve, the radius R3 being larger than the maximum punch diameter in the case of a design with a pure radius Advantageously, the form stamp has an undercut on the stamp, at which the maximum stamp diameter experiences such a taper that a collision between the shaft of the form stamp and the cylindrical part of the stamp-side sheet is prevented
Es ist von Vorteil, wenn eine bewegliche Matrize einen Matrizenhinterschnitt besitzt, an welchem der Matrizeninnendurchmesser eine Verjüngung erfahrt, um die Hinterschneidung im Fugepunkt zu unterstutzenIt is advantageous if a movable die has a die undercut on which the die inner diameter is tapered in order to support the undercut at the joint point
Es kann auch eine feste Matrize verwendet werden Diese sollte dann eine Ausformungsschrage mit einem Winkel und/oder Ubergangskurven zwischen Matrizenstirn und -grund besitzenA fixed die can also be used. This should then have a shaping slope with an angle and / or transition curves between the die face and bottom
Die Erfindung wird nachfolgend an Hand von Ausfuhrungsbeispielen noch naher erläutert In den Zeichnungen zeigenThe invention is explained in more detail below with reference to exemplary embodiments. Show in the drawings
Fig 1 das bekannte Clinchen mit geteilter Matrize und GegenstempelFig. 1 the well-known clinching with divided die and counter-punch
Fig 2 einen Formstempel in ausgelenkter Lage am Ende des UmformvorgangesFig. 2 is a die in a deflected position at the end of the forming process
Fig 3 eine Bewegungsbahn der Kontaktflache zwischen Stempelstirn und Werkstoff3 shows a path of movement of the contact surface between the punch face and the material
Fig 4 eine Vorrichtung mit fester Matrize und flachem Ambos4 shows a device with a fixed die and a flat anvil
In Fig 1 ist das bekannte Clinchen mit geteilter Matrize 4 und Gegenstempel 5 dargestellt Der Stempel 1 dringt in einer axialen Bewegung in die zu verbindenden Bleche 2 und 3 ein Mit dem Einbringen der Vertiefung durch die Werkzeuge wird neben dem Kraftschluß der bekannte Formschlußeffekt, die sogenannte Hinterschneidung 6, zwischen den Fugepartnern erzielt, wobei der Vorgang bis zu einer vorgegebenen Restbodendicke 7 durchgeführt wird und sich ein Halsbereich 8 als entscheidendes Kriterium für die Verbindungsfestigkeit bildetIn Fig. 1 the well-known clinching with divided die 4 and counter-punch 5 is shown. The punch 1 penetrates into the plates 2 and 3 to be connected in an axial movement. With the introduction of the recess by the tools, the known positive-locking effect, the so-called positive-locking effect, is achieved Undercut 6, achieved between the joint partners, the process being carried out up to a predetermined residual floor thickness 7 and a neck region 8 being formed as a decisive criterion for the connection strength
In Fig 2 ist der Formstempel la in ausgelenkter Lage am Ende des Umformvorganges dargestellt Die beiden Bleche 2, 3 werden in eine geteilte Matrize 4 gepreßt, die mit einem Matrizenhinterschnitt 4a versehen ist2 shows the stamp la in a deflected position at the end of the forming process. The two sheets 2, 3 are pressed into a split die 4, which is provided with a die undercut 4a
Bei der Taumelbewegung kippt der Formstempel la um den Winkel α und gemeinsam mit den Radien Rl / R2 von Formstempel la und Gegenstempel 5 wird die Restbodendicke 7 gezielt verjüngt und das Material aus dem Bodenbereich radial nach außen verdrangt In Fig 3 ist eine Bahn einer Taumelbewegung dargestellt Bei der Bewegung des Formstempels inDuring the wobble movement, the forming die la tilts by the angle α and, together with the radii Rl / R2 of the forming die la and counter-die 5, the remaining base thickness 7 is deliberately tapered and the material is displaced radially outward from the base region A path of a wobble movement is shown in FIG. 3 during the movement of the die in FIG
Form einer Rosette wird der Mittelpunkt des Clinchpunktes 13 mehrfach durchlaufen Bei der nach innen, Richtung Zentrum des Punktes verlaufenden Bewegung 14 wird die Stempelkraft verringert, im Extremfall bis auf Null, bei der nach außen gerichteten Bewegung 15 wird eine hohe Stempelkraft F realisiertIn the form of a rosette, the center point of the clinching point 13 is passed through several times. The stamping force is reduced during the inward movement 14 in the direction of the center of the point, in extreme cases to zero, and a high stamping force F is realized with the outward movement 15
Die Stempelkraft F hat also bei steigendem Wert α einen größeren Wert und preßt so denThe punch force F has a larger value with increasing value α and thus presses the
Werkstoff radial nach außen Diese variable Stempelkraft wird mechanisch, servohydraulisch, piezzoelektrisch o dgl erzeugtMaterial radially outwards This variable stamping force is generated mechanically, servo-hydraulically, piezzo-electrically or the like
Der entstehende spezielle Werkstofffluß und der Matrizenhinterschnitt 4a ermöglichen eine bessere Ausbildung des kritischen Halsbereiches 8 und der Hinterschneidung 6The resulting special material flow and the die undercut 4a enable a better design of the critical neck area 8 and the undercut 6
Die Stempelhinterschneidung 9 des Formstempels la ist Voraussetzung für einen horizontal verschiebungsfreien Vorgang und ermöglicht eine zylindrische Innenkontur des FugepunktesThe die undercut 9 of the die la is a prerequisite for a horizontally displacement-free process and enables a cylindrical inner contour of the joint point
In Fig 4 wird auf der rechten Seite der Mittellinie die Vorrichtung mit fester Matrize 10 und auf der linken Seite mit flachem Ambos 11 jeweils im unteren Totpunkt gezeigt Wiederum wird durch den Werkstofffluß ein gut ausgebildeter Halsbereich 8 und eine Hinterschneidung 6 bei geringer Bodendicke 7 erzielt, wobei die Hinterschneidung 6a bei flachem Ambos 11 geringer aber für viele Einsatzfalle ausreichend ist 4 shows the device with a fixed die 10 on the right side of the center line and in the bottom dead center on the left side with a flat anvil 11. Again, the material flow achieves a well-developed neck area 8 and an undercut 6 with a small base thickness 7. the undercut 6a is smaller in the case of a flat anvil 11 but is sufficient for many applications
BezugszeichenlisteReference list
1 - Stempel la- Formstempel1 - stamp la- form stamp
2- Blech2- sheet
3- Blech3- sheet
4- Matrize4- die
4a- Matrizenhinterschnitt4a- die undercut
5- Gegenstempel5- counter stamp
6- Hinterschneidung6- undercut
6a- Hinterschneidung6a- undercut
7- Restbodendicke7- residual floor thickness
8- Halsbereich8-neck area
9- Stempelhinterschneidung9- stamp undercut
10- Matrize10- die
11 - Ambos11 - Anvil
12- Aushebeschräge der Matrize12- Draft elevation of the die
13- Mittelpunkt des Clinchpunktes13- center of the clinch point
14- nach innen, Richtung Zentrum de14- inwards, towards the center of de
15- nach außen gerichtete Bewegung15- outward movement
F - variable StempelkraftF - variable stamping force
Rl - Radius am StempelRl - radius on the stamp
R2- Radius am StempelR2 radius on the stamp
R3- Radius am Gegenstempel R3 radius on counter stamp

Claims

Patentansprüche claims
1. Verfahren zum Verbinden von sich überlappenden plattenförmigen Bauteilen in einem mechanischen Fügeprozeß, wie beispielsweise Blechen, mit einem Formstempel (la) und einer mit einer Ausnehmung versehenen Matrize (4), zwischen denen die zu verbindenden Bauteile (2,3) positioniert werden, dadurch gekennzeichnet, daß der aktiven axialen Vorschubbewegung des Formstempels (la) eine Taumelbewegung während des ganzen Fügeprozesses oder während eines Teiles des Fügeprozesses und eine variable von der Taumelbewegung abhängige Stempelkraft (F) aufgeprägt wird, so daß ein zur Hinterschneidung (6) gerichteter Werkstofffluß erzeugt wird.1. Method for connecting overlapping plate-shaped components in a mechanical joining process, such as sheet metal, with a form stamp (la) and a die (4) provided with a recess, between which the components (2, 3) to be connected are positioned, characterized in that the active axial feed movement of the forming punch (la) is impressed with a wobble movement during the entire joining process or during part of the joining process and a variable punch force (F) dependent on the wobbling movement, so that a material flow directed towards the undercut (6) is produced becomes.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Taumelbewegung des Formstempels (la) unter einem veränderbaren Winkel (α) durchgeführt wird.2. The method according to claim 1, characterized in that the wobble movement of the die (la) is carried out at a variable angle (α).
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die variable Stempelkraft (F) bei steigendem Winkel (α) einen größeren Wert annimmt und bei abnehmendem Winkel (α) auf einen kleineren Wert reduziert wird.3. The method according to claim 1 or 2, characterized in that the variable stamp force (F) assumes a larger value with increasing angle (α) and is reduced to a smaller value with decreasing angle (α).
4. Vorrichtung zum Verbinden von sich überlappenden plattenförmigen Bauteilen in einem mechanischen Fügeprozeß, wie beispielsweise Blechen, mit einem verschiebbaren Formstempel (la) und einer mit einer Ausnehmung versehenen Matrize (4), zwischen denen die zu verbindenden Bauteile (2,3) positionierbar sind, dadurch gekennzeichnet, daß ein mechanisch angetriebener Mechanismus vorgesehen ist, der den Formstempel (la) in eine Taumelbewegung versetzt, ein weiterer mechanisch, servohydraulisch, piezzoelektrisch o. dgl. angetriebener Mechanismus vorgesehen ist, der den Formstempel (la) mit einer variablen Stempelkraft (F) gegen die Ausnehmung der Matrize (4) vorschiebt, wobei der Wert der Stempelkraft (F) in Abhängigkeit von der Taumellage steuerbar ist.4. Device for connecting overlapping plate-shaped components in a mechanical joining process, such as sheet metal, with a displaceable die (la) and a die (4) provided with a recess, between which the components (2, 3) to be connected can be positioned , characterized in that a mechanically driven mechanism is provided which causes the forming punch (la) to wobble, a further mechanically, servohydraulically, piezzo-electrically or the like is provided which drives the forming punch (la) with a variable punch force ( F) advances against the recess of the die (4), the value of the stamping force (F) being controllable as a function of the wobble position.
5. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß der Formstempel (la) eine Stirnform als Radien (R1/R2) und/oder als Kegel und/oder als Schleppkurve besitzt, wobei bei einer Ausbildung mit reinen Radien (Rl) größer ist, als der maximale Stempel durchmesser und der Radius (R2) kleiner ist, als der maximale Stempeldurchmesser. 6 Vorrichtung nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß ein Gegenstempel (5) vorgesehen ist, der eine Stirnform als Radien (R3) und/oder als Kegel und/oder als Schleppkurve besitzt, wobei bei einer Ausbildung mit reinem Radius (R3) dieser großer ist, als der maximale Stempeldurchmesser5. The device according to claim 5, characterized in that the shaping stamp (la) has an end shape as radii (R1 / R2) and / or as a cone and / or as a trailing curve, being larger in the case of training with pure radii (R1), than the maximum punch diameter and the radius (R2) is smaller than the maximum punch diameter. 6 Apparatus according to claim 4 or 5, characterized in that a counter-punch (5) is provided which has an end shape as radii (R3) and / or as a cone and / or as a trailing curve, with a design with a pure radius (R3) this is larger than the maximum punch diameter
7 Vorrichtung nach Anspruch 4 bis 6, dadurch gekennzeichnet, daß der Formstempel (la) eine Stempelhinterschneidung (9) besitzt, an welcher der maximale Stempeldurchmesser eine solche Verjüngung erfahrt, daß eine Kollision zwischen dem Schaft des Formstempels (la) und dem zylinderformigen Teil des stempelseitigen Bleches verhindert wird7 Apparatus according to claim 4 to 6, characterized in that the shaped punch (la) has a punch undercut (9) at which the maximum punch diameter experiences such a taper that a collision between the shaft of the shaped punch (la) and the cylindrical part of the stamp-side sheet is prevented
8 Vorrichtung nach Anspruch 4 bis 7, dadurch gekennzeichnet, daß eine bewegliche Matrize (4) vorgesehen ist, die einen Matrizenhinterschnitt (4a) besitzt, an welchem der Matrizeninnendurchmesser eine Verjüngung erfahrt, um die Hinterschneidung im Fugepunkt zu unterstutzen8 Apparatus according to claim 4 to 7, characterized in that a movable die (4) is provided which has a die undercut (4a), on which the die inner diameter undergoes a taper to support the undercut at the joint point
9 Vorrichtung nach Anspruch 4 bis 8, dadurch gekennzeichnet, daß eine feste Matrize (10) vorgesehen ist, die eine Ausformungsschrage (12) mit einem Winkel und/oder Ubergangskurven zwischen Matrizenstirn und -grund besitzt9 Apparatus according to claim 4 to 8, characterized in that a fixed die (10) is provided which has a shaping slope (12) with an angle and / or transition curves between the die face and bottom
Hierzu 4 Blatt Zeichnungen 4 sheets of drawings
PCT/DE1999/003064 1998-09-25 1999-09-24 Method and device for connecting overlapping flat parts WO2000018528A1 (en)

Priority Applications (5)

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JP2000572038A JP2002525208A (en) 1998-09-25 1999-09-24 Method and apparatus for connecting stacked flat members
US09/787,751 US6473957B1 (en) 1998-09-25 1999-09-24 Method and device for connecting overlapping flat parts
DE59904661T DE59904661D1 (en) 1998-09-25 1999-09-24 METHOD AND DEVICE FOR CONNECTING OVERLAPPING PLATE-SHAPED COMPONENTS
EP99955786A EP1115518B1 (en) 1998-09-25 1999-09-24 Method and device for connecting overlapping flat parts
AT99955786T ATE234696T1 (en) 1998-09-25 1999-09-24 METHOD AND DEVICE FOR CONNECTING OVERLAPPING PLATE-SHAPED COMPONENTS

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DE19843874 1998-09-25
DE19945743.3 1999-09-24
DE19945743A DE19945743A1 (en) 1998-09-25 1999-09-24 Method and device for connecting overlapping plate-shaped components
DE19843874.5 1999-09-24

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EP (1) EP1115518B1 (en)
JP (1) JP2002525208A (en)
AT (1) ATE234696T1 (en)
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EP1115518B1 (en) 2003-03-19
JP2002525208A (en) 2002-08-13

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